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From: H.J. Lu <hjl@sourceware.org> To: gdb-cvs@sourceware.org Subject: [binutils-gdb] gdbserver: Clear X86_XSTATE_MPX bits in xcr0 on x32 Date: Thu, 21 Mar 2024 19:45:14 +0000 (GMT) [thread overview] Message-ID: <20240321194515.63FAC3858D28@sourceware.org> (raw) https://sourceware.org/git/gitweb.cgi?p=binutils-gdb.git;h=4bb20a6244b7091a9a7a2ae35dfbd7e8db27550a commit 4bb20a6244b7091a9a7a2ae35dfbd7e8db27550a Author: H.J. Lu <hjl.tools@gmail.com> Date: Wed Mar 20 04:13:18 2024 -0700 gdbserver: Clear X86_XSTATE_MPX bits in xcr0 on x32 Since MPX isn't available for x32, we should clear X86_XSTATE_MPX bits on x32. PR server/31511 * linux-x86-low.cc (x86_linux_read_description): Clear X86_XSTATE_MPX bits in xcr0 on x32. Reviewed-by: Felix Willgerodt <felix.willgerodt@intel.com> Diff: --- gdbserver/linux-x86-low.cc | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/gdbserver/linux-x86-low.cc b/gdbserver/linux-x86-low.cc index 3af0a009052..933d1fb012a 100644 --- a/gdbserver/linux-x86-low.cc +++ b/gdbserver/linux-x86-low.cc @@ -938,6 +938,10 @@ x86_linux_read_description (void) xcr0 = xstateregs[(I386_LINUX_XSAVE_XCR0_OFFSET / sizeof (uint64_t))]; + /* No MPX on x32. */ + if (machine == EM_X86_64 && !is_elf64) + xcr0 &= ~X86_XSTATE_MPX; + xsave_len = x86_xsave_length (); /* Use PTRACE_GETREGSET if it is available. */
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